Add the possibility for checkpointing #286
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These are very useful for checkpointing
This function is similar to `read_function_from_xdmf` but requires a function space. The benefit: We can import mesh and function simultaneously.
This can then be used for checkpointing and restarting simulations / optimizations
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Now, the parameter Output.save_mesh saves a Gmsh mesh file for each iteration. This can be used with import_function to do a checkpointing.
Still to do: Document this feature, see #280